idiosyncrasy vs foible

idiosyncrasy and foible both are nouns.

Word	Noun	Adjective	Verb	Adverb
idiosyncrasy	Yes	No	No	No
foible	Yes	No	No	No

As nouns, idiosyncrasy and foible are synonyms defined as:

idiosyncrasy and foible: a behavioral attribute that is distinctive and peculiar to an individual

Other synonyms of idiosyncrasy include mannerism.

idiosyncrasy (noun)	foible (noun)
a behavioral attribute that is distinctive and peculiar to an individual	the weaker part of a sword's blade from the forte to the tip
	a behavioral attribute that is distinctive and peculiar to an individual
	a minor flaw or shortcoming in character or behavior.